About as irrefutable as his information on Hussein and Afghanistan. Whats interesting is this is not the first time and certainly not the last time he will try to implicate Iran regardless of the fact Israel already has Nuclear Weapons and categorically refuses to let the UN inspect them.
Of course there are other countries who have nuclear weapons who also refused to sign the treaty however they are not the ones constantly attacking Iran.
So who is lying here?
And that 'diagram' of the progress of a nuclear bomb. Looks like something you would show when pitching a loony toons cartoon :P